remove build-doc for ch7

Author: scPointer

.github/workflows/build.yml

@@ -7,23 +7,6 @@ env:
   rust_toolchain: nightly
 
 jobs:
-  build-doc:
-    if: github.repository == 'LearningOS/rCore-Tutorial-Code-2025S'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Build doc
-        run: |
-          git clone https://github.com/LearningOS/rCore-Tutorial-Test-2025S.git user
-          cd os
-          make
-          cargo doc --no-deps --verbose
-      - name: Push to gh-pages
-        uses: peaceiris/actions-gh-pages@v3
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./os/target/riscv64gc-unknown-none-elf/doc
-          destination_dir: ${{ github.ref_name }}
   basic-test:
     runs-on: ubuntu-latest
     outputs: